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Science, Chemistry
11th
grade
Molar Mass, Percent Composition, and Empirical Formulas
25 questions
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- 1. Multiple ChoiceWhat is the molar mass of fluorine gas?
(beware!)18.998 g/mol38 g/mol9 g/mol18 g/mol - 2. Multiple ChoiceWhat is the molar mass of table salt (NaCl)?116.886 g/mol35.453 g/mol22.990 g/mol58.443 g/mol
- 3. Multiple ChoiceWhat is the mass of one mole of aluminum?27 g13 g54 g14 g
- 4. Multiple ChoiceHow many particles are in a mole?602602 million602 moles6.02 x 1023
- 5. Multiple Choice
Calculate the molar mass of Ba(C2H3O2)2
255.3 g/mol
237.3 g/mol
228.3 g/mol
196.3 g/mol
- 6. Multiple Choice
Calculate the molar mass for Al(OH)3
78.0 g/mol
72 g/mol
28 g/mol
25 g/mol
- 7. Multiple ChoiceThe mass of one mole of substance is called...molecular massmole constantmolar massatomic weight
- 8. Multiple Choice
What is the mass of 1 mole of sulfur?
16g
32g
6.02x1023g
1g
- 9. Multiple Choice
What is the mass of 2.4 mol of carbon?
29g
0.20g
5.0g
6.02 x 1023g
- 10. Multiple Choice
How many moles of uranium would 400. grams make?
1.68 mol
0.595 mol
95,200 mol
2.41 x 1026
- 11. Multiple ChoiceWhat is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?20%27%46%53%
- 12. Multiple ChoiceIn which compound is the percent composition by mass of Cl equal to 42%?HClO (gram formula mass = 52 g/mol)HClO2 (gram formula mass = 68 g/mol)HClO3 (gram formula mass = 84 g/mol)HClO4 (gram formula mass = 100 g/mol)
- 13. Multiple Choice
What is the percent by mass of N in (NH4)2S?
47.1%
68.1%
44.1%
41.1%
- 14. Multiple ChoiceWhich conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C6H12O6?1 mole = 78.12 g1 mole = 22.4 L1 mol = 6.02x 1023 particlesmore than one
- 15. Multiple ChoiceWhich conversion factor should be used to solve the following, "How many moles in 28 grams of CO2?"1 mol = 22.4 L1 mol = 44.01 g1 mol = 6.02x1023 atomsmore than one
- 16. Multiple ChoiceWhat is the molar mass of Hydrogen Peroxide (H2O2)?48 g/mole34.02 g/mole36.5 g/mole35.5 g/mole
- 17. Multiple ChoiceHow many moles are in 16.94g of water?16.94 mol H2O0.9401 mol H2O305.3 mol H2O1.063 mol H2O
- 18. Multiple ChoiceHow many molecules are in 9.44 moles of AlCl3?5.68 molec AlCl35.68x1024 molec AlCl30.705 molec AlCl31.25x1023 molec AlCl3
- 19. Multiple ChoiceWhat is the mass in grams of 5.90 mol C8H18?.0512 g19.4 g673 g389 g
- 20. Multiple Choice
Which element has an abundance of 39.03% in the compound sodium phosphate, Na3PO4
Na
P
O
None of the above
- 21. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 22. Multiple Choice
How many molecules are in 2.5 mol of NaCl?
1.5 x 1024 molecules
1.5 molecules
4.15 molecules
1.5 x 1023 molecules
- 23. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 24. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 25. Multiple ChoiceGlycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?C2H3O2CH2OC2H4O2C3H8O3
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